The familiar design, pin-point accuracy, social aspects, and gamification of Swarm make it the best app for sharing locations with your friends.
Nuzzel is the best news aggregation service because it's easy to set up, intuitive in use, and well-designed.
Narwhal is easy to navigate, the interface makes sense in every way, and it actually feels enjoyable to use.
Pinner is our favorite Pinboard app because of its clean layout, powerful features, and more.
Just updated, Tweetbot has all the features you're likely to need and then some, plus it is delightfully well designed.